The US Has More Than 900 Measles Cases and 10 States Have Outbreaks. Here's What to Know

2010-03-17T120000Z_1210677436_GM1E63I0DYL01_RTRMADP_3_USA
One-fifth of states have active measles outbreaks as confirmed cases nationwide keep ticking up, according to the U.S. Centers for Disease Control and Prevention.

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